Offshore photovoltaic floating type foundation structure

Abstract

The utility model belongs to the technical field of offshore foundations, and discloses an offshore photovoltaic floating type foundation structure which is characterized in that a first lantern ring is sleeved outside a central fixing pile, the first lantern ring is connected with basic floating units through a second lantern ring, and the adjacent basic floating units are flexibly connected through an external connecting cable; the basic floating units can freely move up and down relative to the central fixed pile under the action of buoyancy; each basic floating unit comprises an external floating frame and an internal floating block group, photovoltaic modules are mounted on the surface of the internal floating block group, and all the photovoltaic modules face the same direction; a propeller is arranged at the tail end of each external floating frame, and all the basic floating units can be pushed to rotate by controlling the rotating speed of each propeller, so that the photovoltaic module rotates along with the rotation of the sun. According to the utility model, the sea surface space is fully utilized, meanwhile, the marine environment with large wave height and large tidal range can be adapted, and on the basis of economic feasibility and construction convenience, the maximum use of marine photovoltaic resources is finally realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of offshore foundations, and specifically relates to an offshore photovoltaic floating foundation structure. Background Art

[0002] Since traditional ground-based photovoltaic power stations require a large amount of land, as land costs continue to rise, large-scale land acquisition for photovoltaic power generation has become more difficult. However, the trend of floating photovoltaic projects in lakes, reservoirs, coal subsidence areas and even offshore is increasing. Compared with land-based photovoltaic power generation, offshore photovoltaics have many advantages, such as not occupying land resources, improving water utilization and reducing water surface evaporation. Offshore photovoltaics use two types of foundation structures, fixed and floating. Compared with fixed ones, floating foundation structures have the advantages of being more suitable for deep water areas and easier to recycle and reuse. Therefore, the development of offshore photovoltaic floating foundation structures is an important direction for the future.

[0003] Due to the harsh and complex marine environment, offshore photovoltaic floating foundation structures need to have sufficient strength and moderate flexibility to withstand environmental loads. Currently, existing floating photovoltaic foundations are mostly used in mild water conditions, but these structures cannot meet the requirements of the marine environment with large wave heights and tidal ranges. Utility Model Content

[0004] The utility model aims to improve the carrying capacity of the floating foundation structure for harsh and complex marine environments, and provides an offshore photovoltaic floating foundation structure that can fully utilize the sea surface space and adapt to the marine environment with large wave heights and large tidal ranges. On the basis of economic feasibility and construction convenience, it ultimately realizes the maximum use of offshore photovoltaic resources.

[0005] In order to solve the above technical problems, the utility model is implemented through the following technical solutions:

[0006] The utility model provides an offshore photovoltaic floating foundation structure, comprising a central fixed pile; the central fixed pile is covered with a first ring on the outside, and the first ring is connected to a basic floating unit through a plurality of the second rings; a plurality of the basic floating units are evenly arranged around the first ring in an annular direction, and adjacent basic floating units are flexibly connected through external connecting cables; the first ring, the second ring and the basic floating unit can freely move up and down relative to the central fixed pile under the action of buoyancy;

[0007] Each of the basic floating units includes an external floating frame, and the second ring is simultaneously connected to the external floating frame and the first ring to realize the connection between the basic floating unit and the first ring; an internal floating block group is arranged inside the external floating frame, and the internal floating block group is composed of a plurality of parallel arranged floating blocks, and the floating blocks and the external floating frame are flexibly connected through internal connecting cables; photovoltaic components are installed on the surface of the floating blocks of the internal floating block group, and the photovoltaic components are continuously arranged along the length direction of the floating blocks; the photovoltaic components of all basic floating units are oriented in the same direction; a propeller is arranged on the outer side of the end of each external floating frame, and the rotation speed of each propeller can be controlled to drive the rotation of all basic floating units, so that the photovoltaic components can rotate with the sun.

[0008] Furthermore, the first ring and the second ring are both circular ring structures made of hollow tubes; when the first ring and the second ring are in a socketed state, the first ring can move freely up and down relative to the central fixed pile; the inner diameter of the second ring is greater than the sum of the cross-sectional diameter of the first ring and the cross-sectional diameter of the external floating frame.

[0009] Furthermore, the number of the basic floating units is 3 to 5, and the number of the second rings is the same as that of the basic floating units and corresponds one to one.

[0010] Furthermore, the photovoltaic assembly is connected to the floating blocks of the internal floating block group through a rigid bracket, and the inclination angle of the photovoltaic assembly relative to the horizontal plane is 10°-30°.

[0011] Furthermore, the photovoltaic assembly is equipped with an automatic spraying device, and the automatic spraying device is evenly distributed relative to the photovoltaic assembly installed on each of the floating blocks.

[0012] Furthermore, the external floating frame is a frame structure made of a hollow tube, including a triangular section close to the central fixed pile and a rectangular section far away from the central fixed pile, the triangular section and the rectangular section are integrally connected to form a pentagonal frame, the pentagonal frame is axially symmetrical and all vertex angles are chamfered; the second ring is installed at the vertex position of the triangular section of the external floating frame.

[0013] Furthermore, the length direction of each of the floating blocks is perpendicular to the frame of the external floating frame that is farthest from the central fixing pile, and the plurality of floating blocks are arranged in parallel along their length directions.

[0014] Furthermore, both ends of the external connecting cable are respectively fixed at the triangular section of the external floating frame in the adjacent basic floating unit; the internal connecting cables connected on both sides of each floating block include multiple groups, with three cables in each group; and the internal connecting cables connected at both ends of each floating block are two, which are used for connecting the floating block and the external floating frame.

[0015] Furthermore, the propellers are provided at two vertex corners of the external floating frame of each basic floating unit away from the central fixing pile, and the two propellers whose central axes are 90 degrees to each other are respectively installed on both sides of each vertex.

[0016] Furthermore, the outer floating frame of each of the basic floating units is provided with a rubber fender, and the rubber fender is arranged outside the triangular section of the outer floating frame.

[0017] The beneficial effects of the utility model are:

[0018] The offshore photovoltaic floating foundation structure of the utility model flexibly connects the internal floating block group and the external floating frame, installs photovoltaic components and accessories to form a basic floating unit, and then arranges multiple basic floating units in a specific manner to provide buoyancy, and is connected to a central fixed pile by a first set of rings and a second set of rings, so that the movement of the foundation structure is restricted within a certain range. Therefore, it is possible to improve the overall stability and anti-overturning stability of the foundation structure while reducing the rigidity of the foundation structure and the load inside the system, so that the foundation structure has better movement performance under the action of complex marine environmental loads, and at the same time fully utilizes the sea surface space to ensure that the power generation efficiency of photovoltaic resources is maximized. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural schematic diagram of the offshore photovoltaic floating foundation structure provided by the utility model;

[0020] Figure 2 It is a top view of the offshore photovoltaic floating foundation structure provided by the utility model;

[0021] Figure 3 It is a three-dimensional structural schematic diagram of a basic floating unit in the offshore photovoltaic floating foundation structure provided by the utility model;

[0022] Figure 4 This is a front view of a basic floating unit in the offshore photovoltaic floating foundation structure provided by the utility model;

[0023] Figure 5 It is a top view of a basic floating unit in the offshore photovoltaic floating foundation structure provided by the utility model.

[0024] In the figure: 1. central fixed pile; 2. first set of rings; 3. second set of rings; 4. basic floating unit; 401. external floating frame; 402. internal floating block group; 403. photovoltaic module; 404. rigid support; 405. propeller; 406. automatic spraying device; 407. rubber fender; 408. internal connecting cable; 5. external connecting cable. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below through specific examples. The following examples can enable those skilled in the art to more fully understand the present invention, but do not limit the present invention in any way.

[0026] like Figure 1 and Figure 2 As shown, an offshore photovoltaic floating foundation structure of the utility model includes a central fixed pile 1, a first ring 2, a second ring 3, a basic floating unit 4, and an external connecting cable 5.

[0027] The central fixed pile 1 is a cylindrical structure, the bottom of which is fixed to the seabed to achieve the anchoring effect of the entire offshore photovoltaic floating foundation structure. The central fixed pile 1 is generally fixed to the seabed by piling, drilling or spraying, and the central fixed pile 1 is installed at a specific depth below the seabed surface. As a preferred embodiment, the diameter of the central fixed pile 1 is selected in the range of 6 to 8 meters, and the length is selected in the range of 35 to 55 meters.

[0028] The first ring 2 is sleeved on the outside of the central fixed pile 1. The first ring 2 is a circular ring structure and is preferably made of a hollow tube. The first ring 2 should be able to move freely up and down relative to the central fixed pile 1 after connecting the second ring 3. For reference, the inner diameter of the first ring 2 is greater than the sum of the outer diameter of the central fixed pile 1 and twice the cross-sectional diameter of the second ring 3. As a preferred embodiment, the outer diameter of the first ring 2 is selected within the range of 13 to 15m, and the pipe diameter is selected within the range of 1.5 to 2.5m.

[0029] Multiple second rings 3 are all sleeved on the first ring 2. The second ring 3 is a circular ring structure and is preferably made of a hollow tube. The second ring 3 is used to connect the basic floating unit 4 to the first ring 2. The number of the second rings 3 is preferably the same as the number of the basic floating units 4. For reference, the inner diameter of the second ring 3 is greater than the sum of the cross-sectional diameter of the first ring 2 and the cross-sectional diameter of the external floating frame 42. As a preferred embodiment, the outer diameter of the second ring 3 is selected in the range of 6 to 8 m, and the pipe diameter is selected in the range of 0.8 to 1.2 m.

[0030] The basic floating unit 4 is connected to the first ring 2 through the second ring 3 to achieve limited movement of the basic floating unit 4 in the circumferential direction and radial direction relative to the first ring 2. A plurality of basic floating units 4 are evenly installed around the central fixed pile 1 in the circumferential direction. The number of basic floating units 4 is generally 3 to 5, which can maximize the use of ocean and photovoltaic resources under the premise of ensuring that each basic floating unit 4 does not collide and damage.

[0031] like Figure 3-Figure 5 As shown, the basic floating unit 4 mainly includes an external floating frame 401, an internal floating block group 402, a photovoltaic module 403, a rigid support 404, an automatic spraying device 405, a propeller 406, a rubber fender 407, and a steel wire connecting cable 408.

[0032] The external floating frame 401 is generally a frame structure, preferably made of a hollow tube. The external floating frame 401 includes a triangular section close to the central fixed pile 1 and a rectangular section away from the central fixed pile 1. The triangular section and the rectangular section are integrally connected to form a pentagonal frame, which is axially symmetrical and all the vertex angles are rounded. The pentagonal frame shape design of the external floating frame 401 can not only maximize the use of ocean and photovoltaic resources, but also ensure that there is enough spacing between adjacent basic floating units to reduce collision damage; all its vertex angles are rounded, which can reduce the damage to the structure due to stress concentration at the sharp corners. As a preferred embodiment, the external floating frame 401 is 34 to 36 meters long, 23 to 25 meters wide, 0.8 to 1.5 meters in cross-sectional diameter, and 10 mm to 30 mm in cross-sectional wall thickness. The external floating frame 401 is used to connect to the first ring 2 through the second ring 3 and provide protection for the internal floating block group 402. According to the structural design of the external floating frame 401 , the second ring 3 is arranged at the vertex position of its triangular section, which can impose certain constraints on the second ring 3 and greatly reduce the movement of the second ring 3 along the external floating frame 401 .

[0033] The internal floating block group 402 is arranged in the internal space of the external floating frame 401, and is composed of a plurality of floating blocks arranged in parallel. There is a spacing between the floating blocks and between the floating blocks and the external floating frame 401, and they are connected by an internal connecting cable 408. In order to more effectively utilize the internal space of the external floating frame 401, the length direction of each floating block is perpendicular to the frame of the external floating frame 401 farthest from the central fixed pile 1, and the plurality of floating blocks are arranged in parallel with their length directions. As a preferred embodiment, the floating blocks of the internal floating block group 41 are rectangular shell structures made of HDPE material, usually with a length of 22 to 29m, a width of 2 to 3m, a height of 0.8 to 1.2m, and a wall thickness of 10mm to 20mm.

[0034] The internal connection cable 408 can be made of steel cables, steel wire ropes, etc., and is used to form a flexible connection between the floating blocks and between the floating blocks and the external floating frame 401. As a preferred embodiment, the internal connection cables 408 connected on both sides (i.e., in the length direction) of each floating block include multiple groups, each group is provided with three cables, which are used for connecting between the floating blocks and between the floating blocks and the external floating frame 401; the internal connection cables 408 connected on both ends (i.e., in the width direction) of each floating block are two, which are used for connecting the floating blocks and the external floating frame 401. As a preferred embodiment, the length of the internal connection cable 408 is 0.5m to 2.5m.

[0035] Adjacent basic floating units 4 are flexibly connected by external connecting cables 5, and the external connecting cables 5 can be made of steel cables, steel wire ropes, etc. The two ends of the external connecting cables 5 are respectively fixed at the triangular sections of the external floating frames 401 in the adjacent basic floating units 4, so that the basic floating units 4 can not only move in a limited manner in the circumferential direction relative to the first ring 2, but also avoid collision damage as much as possible. As a preferred embodiment, two external connecting cables 5 are arranged at three equal positions on each side of the triangular section of the external floating frame 401.

[0036] The connection of the internal connecting cable 408 within the basic floating unit 4 and the connection of the external connecting cable 5 between the basic floating units 4 can reduce the rigidity of the basic structure while ensuring the overall strength of the basic structure, making the basic structure more suitable for environments with changeable and harsh wave conditions, while also making full use of ocean and photovoltaic resources.

[0037] The photovoltaic modules 403 are mounted on the surface of the floating blocks of the internal floating block group 402 and are arranged continuously along the length direction of the floating blocks. The photovoltaic modules 403 are connected to the floating blocks of the internal floating block group 402 through the rigid bracket 404. Preferably, the inclination angle of the photovoltaic modules 403 relative to the horizontal plane is set in the range of 10°-30°. The size and inclination angle of the photovoltaic modules 3 are determined so that the light is not blocked between the adjacent photovoltaic modules 3.

[0038] The photovoltaic components 403 of all the basic floating units 4 are oriented in the same direction so that as many photovoltaic components 403 as possible can always face the sun directly, so as to achieve the purpose of maximizing the photovoltaic utilization rate. Therefore, for each basic floating unit 4, the arrangement of its photovoltaic components 403 relative to the external floating frame 401 is different. Taking the four basic floating units 4 in this embodiment as an example, the photovoltaic components 403 in two relatively arranged basic floating units 4 are arranged in the same position, wherein the photovoltaic components 403 in two basic floating units 4 are tilted with their length direction as the rotation axis, and the photovoltaic components 403 in the other two basic floating units 4 are tilted with their width direction as the rotation axis.

[0039] Furthermore, the photovoltaic module 403 is equipped with an automatic spray device 405, which is evenly distributed relative to the photovoltaic module 403 to eliminate salt fog in the marine environment, prevent salt fog from corroding and damaging the photovoltaic module 403, and reduce the performance and life of the photovoltaic module 403. Correspondingly, the automatic spray device 405 of each basic floating unit 4 is set in a different manner: for the photovoltaic module 403 tilted with the length direction as the rotation axis, a group of automatic spray devices 405 can be arranged between two adjacent floating blocks, and the automatic spray devices 405 of the two adjacent groups are arranged alternately; for the photovoltaic module 403 tilted with the width direction as the rotation axis, a group of automatic spray devices 405 can be arranged at the edge of each floating block. As a preferred embodiment, the number of each group of automatic spray devices 405 is generally in the range of 3 to 5, and the interval is generally in the range of 6 to 8m.

[0040] The outer floating frame 401 of each basic floating unit 4 is provided with propellers 406 at two vertex angles away from the central fixed pile 1, and a propeller 406 is installed on both sides of each vertex, that is, the central axes of the two propellers 406 are arranged at 90 degrees to each other. In this way, by controlling the rotation speed of each propeller 406, the rotation of all basic floating units 4 can be driven, so that the entire basic structure rotates with the rotation of the sun, so that all photovoltaic modules 403 are always facing the sun as much as possible, and the utilization rate of all photovoltaic modules 403 is maximized.

[0041] Furthermore, the outer floating frame 401 of each basic floating unit 4 is provided with a rubber fender 407, which is generally arranged outside the triangular section of the outer floating frame 401 to reduce the destructive effect of the collision of adjacent basic floating units 4 on the structure. The rubber fender 407 can be a D-type, drum-type, rectangular, cylindrical fender, etc. The size of the rubber fender 407 is generally selected based on the ability to wrap the outer floating frame 401. As a preferred embodiment, the rubber fender 407 is placed at the midpoint and bottom corner of the triangular section in the outer floating frame 401.

[0042] The above-mentioned offshore photovoltaic floating foundation structure can be constructed according to the following steps:

[0043] (1) A plurality of buoys are connected to form an internal buoy group 402 via an internal connection cable 408 .

[0044] (2) The outer floating frame 401 is installed on the outer periphery of the inner floating block group 402 , and the inner floating block group 402 and the outer floating frame 401 are connected by the inner connecting cable 408 .

[0045] (3) A rigid support 404 is installed on the internal floating block group 402, the photovoltaic modules 403 are fixed on the rigid support 404, and the angles of all photovoltaic modules 403 are adjusted according to the optimal power generation efficiency.

[0046] (4) Automatic spray devices 405 are evenly distributed on the internal floating block group 402 , propellers 406 are installed at the two vertex corners outside the external floating frame 401 , and rubber fenders 407 are installed outside the triangular section of the external floating frame 401 .

[0047] (5) The basic floating unit 4 obtained in step (4) is launched into water, and the air tightness of the internal floating block group 402 and the external floating frame 401 is checked.

[0048] (6) Under the premise of ensuring airtightness, the multiple basic floating units 4 obtained in step (4) are transported to the target sea area by a tugboat.

[0049] (7) The prefabricated central fixed pile 1, the first set of rings 2, and the second set of rings 3 are transported to the target sea area by a tugboat, and a crane ship is used in conjunction with a pile hammer to carry out the lifting and driving construction. After the piling is completed, the first set of rings 2 is installed on the outer periphery of the central fixed pile 1.

[0050] (8) After transporting multiple basic floating units 4 to the target sea area, they are anchored and positioned, and each basic floating unit 4 is connected to the first ring 2 through the second ring 3.

[0051] Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments, which are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms of specific changes without departing from the scope of protection of the invention and the claims, all of which fall within the scope of protection of the present invention.

Claims

1. An offshore photovoltaic floating foundation structure, comprising a central fixed pile; characterized in that: The central fixed pile is covered with a first ring on the outside, and the first ring is connected to a basic floating unit through a plurality of second rings; the plurality of basic floating units are evenly distributed around the first ring, and adjacent basic floating units are flexibly connected through external connecting cables; the first ring, the second ring and the basic floating unit can freely move up and down relative to the central fixed pile under the action of buoyancy; Each of the basic floating units includes an external floating frame, and the second ring is simultaneously connected to the external floating frame and the first ring to realize the connection between the basic floating unit and the first ring; an internal floating block group is arranged inside the external floating frame, and the internal floating block group is composed of a plurality of parallel arranged floating blocks, and the floating blocks and the external floating frame are flexibly connected through internal connecting cables; photovoltaic components are installed on the surface of the floating blocks of the internal floating block group, and the photovoltaic components are continuously arranged along the length direction of the floating blocks; the photovoltaic components of all basic floating units are oriented in the same direction; a propeller is arranged on the outer side of the end of each external floating frame, and the rotation speed of each propeller can be controlled to drive the rotation of all basic floating units, so that the photovoltaic components can rotate with the sun.

2. The offshore photovoltaic floating foundation structure according to claim 1, characterized in that: The first ring and the second ring are both circular ring structures made of hollow tubes; when the first ring and the second ring are in a socketed state, the first ring can move freely up and down relative to the central fixed pile; the inner diameter of the second ring is greater than the sum of the cross-sectional diameter of the first ring and the cross-sectional diameter of the external floating frame.

3. The offshore photovoltaic floating foundation structure according to claim 1, characterized in that: The number of the basic floating units is 3 to 5, and the number of the second rings is the same as that of the basic floating units and corresponds one to one.

4. The offshore photovoltaic floating foundation structure according to claim 1, characterized in that: The photovoltaic assembly is connected to the floating blocks of the internal floating block group through a rigid bracket, and the inclination angle of the photovoltaic assembly relative to the horizontal plane is 10°-30°.

5. The offshore photovoltaic floating foundation structure according to claim 1, characterized in that: The photovoltaic assembly is equipped with an automatic spraying device, and the automatic spraying device is evenly distributed relative to the photovoltaic assembly installed on each of the floating blocks.

6. The offshore photovoltaic floating foundation structure according to claim 1, characterized in that: The external floating frame is a frame structure made of a hollow tube, including a triangular section close to the central fixed pile and a rectangular section far away from the central fixed pile. The triangular section and the rectangular section are integrally connected to form a pentagonal frame. The pentagonal frame is axially symmetrical and all vertex angles are chamfered. The second ring is installed at the vertex position of the triangular section of the external floating frame.

7. The offshore photovoltaic floating foundation structure according to claim 6, characterized in that: The length direction of each floating block is perpendicular to the frame of the outer floating frame farthest from the central fixing pile, and the plurality of floating blocks are arranged in parallel along their length directions.

8. The offshore photovoltaic floating foundation structure according to claim 6, characterized in that: The two ends of the external connecting cable are respectively fixed at the triangular section of the external floating frame in the adjacent basic floating unit; the internal connecting cables connected on both sides of each floating block include multiple groups, with three cables in each group; the internal connecting cables connected at both ends of each floating block are two, which are used for connecting the floating block and the external floating frame.

9. The offshore photovoltaic floating foundation structure according to claim 6, characterized in that: The propellers are arranged at two vertex corners of the external floating frame of each basic floating unit away from the central fixing pile, and the two propellers whose central axes are 90 degrees to each other are respectively installed on both sides of each vertex corner.

10. The offshore photovoltaic floating foundation structure according to claim 6, characterized in that: The outer floating frame of each basic floating unit is provided with a rubber fender, and the rubber fender is arranged outside the triangular section of the outer floating frame.

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